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Observation of parity nonconservation in møller scattering.

Anthony, P L; Arnold, R G; Arroyo, C; Baird, K; Bega, K; Biesiada, J; Bosted, P E; Breuer, M; Carr, R; Cates, G D; Chen, J-P; Chudakov, E; Cooke, M; Decker, F J; Decowski, P; Deur, A; Emam, W; Erickson, R; Fieguth, T; Field, C; Gao, J; Gustafsson, K; Hicks, R S; Holmes, R; Hughes, E W; Humensky, T B; Jones, G M; Kaufman, L J; Kolomensky, Yu G; Kumar, K S; Lhuillier, D; Lombard-Nelsen, R; Mastromarino, P; Mayer, B; McKeown, R D; Michaels, R; Olson, M; Paschke, K D; Peterson, G A; Pitthan, R; Pope, K; Relyea, D; Rock, S E; Saxton, O; Shapiro, G; Singh, J; Souder, P A; Szalata, Z M; Tobias, W A; Tonguc, B T.

Phys Rev Lett ; 92(18): 181602, 2004 May 07.

Artigo em Inglês | MEDLINE | ID: mdl-15169482

RESUMO

We report a measurement of the parity-violating asymmetry in fixed target electron-electron (Møller) scattering: A(PV)=[-175+/-30(stat)+/-20(syst)] x 10(-9). This first direct observation of parity nonconservation in Møller scattering leads to a measurement of the electron's weak charge at low energy Q(e)(W)=-0.053+/-0.011. This is consistent with the standard model expectation at the current level of precision: sin((2)theta(W)(M(Z))((-)MS)=0.2293+/-0.0024(stat)+/-0.0016(syst)+/-0.0006(theory).

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